100th ST over Keigley Branch
PoorPosted for loadStory County, Iowa · 085240501 · Structure no. 000000000316280
- Built
- 1900
- 125 years old, rebuilt 1974
- Condition
- Poor
- inspected November 2022
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 60 ft
- 4 main spans
- Daily traffic
- 15
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
100th ST over Keigley Branch is a wood or timber stringer/multi-beam or girder carrying 100th ST over Keigley Branch in Story County, Iowa. It was built in 1900 and reconstructed in 1974, so it is 125 years old, older than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.
It carries about 15 vehicles a day, projected to reach 15 by 2043. The structure is 60 ft (18.3 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 100th ST over Keigley Branch built?
It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1974.
What condition is 100th ST over Keigley Branch in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2022.
How much traffic does 100th ST over Keigley Branch carry?
About 15 vehicles per day (2022 count).
How long is 100th ST over Keigley Branch?
The structure is 60 ft (18.3 m) long with a longest span of 15 ft (4.6 m) and a deck 24 ft wide.
Who owns 100th ST over Keigley Branch?
It is owned by the County Highway Agency.